diff --git a/src/BigCommerce/ResourceModels/Catalog/Product/PriceAdjuster.php b/src/BigCommerce/ResourceModels/Catalog/Product/PriceAdjuster.php
index c97ed1b..0bc6d9b 100644
--- a/src/BigCommerce/ResourceModels/Catalog/Product/PriceAdjuster.php
+++ b/src/BigCommerce/ResourceModels/Catalog/Product/PriceAdjuster.php
@@ -9,6 +9,6 @@ class PriceAdjuster extends ResourceModel
     public const ADJUSTER_RELATIVE = 'relative';
     public const ADJUSTER_FIXED    = 'fixed';
 
-    public string $adjuster;
+    public string $adjuster = self::ADJUSTER_FIXED;
     public float $adjuster_value;
 }
diff --git a/src/BigCommerce/ResourceModels/Catalog/Product/WeightAdjuster.php b/src/BigCommerce/ResourceModels/Catalog/Product/WeightAdjuster.php
index 26a2112..6f98ad1 100644
--- a/src/BigCommerce/ResourceModels/Catalog/Product/WeightAdjuster.php
+++ b/src/BigCommerce/ResourceModels/Catalog/Product/WeightAdjuster.php
@@ -6,6 +6,9 @@
 
 class WeightAdjuster extends ResourceModel
 {
-    public string $adjuster;
+    public const ADJUSTER_RELATIVE = 'relative';
+    public const ADJUSTER_FIXED    = 'fixed';
+
+    public string $adjuster = self::ADJUSTER_FIXED;
     public float $adjuster_value;
 }
diff --git a/tests/BigCommerce/Api/Catalog/Products/ProductModifier/ProductModifierValuesApiTest.php b/tests/BigCommerce/Api/Catalog/Products/ProductModifier/ProductModifierValuesApiTest.php
index b98e09c..5cd3b49 100644
--- a/tests/BigCommerce/Api/Catalog/Products/ProductModifier/ProductModifierValuesApiTest.php
+++ b/tests/BigCommerce/Api/Catalog/Products/ProductModifier/ProductModifierValuesApiTest.php
@@ -2,6 +2,8 @@
 
 namespace BigCommerce\Tests\Api\Catalog\Products\ProductModifier;
 
+use BigCommerce\ApiV3\ResourceModels\Catalog\Product\PriceAdjuster;
+use BigCommerce\ApiV3\ResourceModels\Catalog\Product\ProductModifier;
 use BigCommerce\ApiV3\ResourceModels\Catalog\Product\ProductModifierValueData;
 use BigCommerce\Tests\BigCommerceApiTest;
 
@@ -68,4 +70,24 @@ public function testCanUpdateModifierValue()
 
         $this->assertJsonStringEqualsJsonString($expectedJson, json_encode($modifierValue));
     }
+
+    public function testCanSetDefaultAdjusterType()
+    {
+        $adjuster = new PriceAdjuster();
+        $this->assertEquals(PriceAdjuster::ADJUSTER_FIXED, $adjuster->adjuster);
+
+        $this->setReturnData('catalog__products__modifiers__222__values__190__get.json');
+
+        $modifierValue = $this->getApi()
+            ->catalog()->product(1)->modifier(222)->value(190)->get()->getModifierValue();
+
+        $this->assertEquals(PriceAdjuster::ADJUSTER_RELATIVE, $modifierValue->adjusters->price->adjuster);
+
+        $this->setReturnData('catalog__products__modifiers__222__values__190__get-no-adjuster.json');
+
+        $modifierValue = $this->getApi()
+            ->catalog()->product(1)->modifier(222)->value(190)->get()->getModifierValue();
+
+        $this->assertEquals(PriceAdjuster::ADJUSTER_FIXED, $modifierValue->adjusters->price->adjuster);
+    }
 }